Question

Attendence
(
  Stu_id int
  Att_Id int
  Att_Date datetime
  Att_Num numeric(15,5)
)

This table basically contains attendence records. I am trying to find the logic to enter the rows for missing dates from 1 Jan 2012 till today.

Assume there is a single attendence record for this period row (1,1,'2012-05-06',1.20000). Then I would like to insert rows for each day from 1 Jan 2012 till today except the existing date with the same values for all the fields except the date field which should be the actual date.

I am trying to bulk insert all the rows but don’t know how would I adjust the date field
and check for the existing date.

Thanks.

Answer 1

Try a stored procedure which loops through the dates.

Or better yet, make a dates table and select from that. This will be much faster. Something like:

INSERT INTO Attendence (Stu_id, Att_Id, Att_Date, Att_Num)
SELECT a.Stu_id, a.Att_Id, d.TheDate, a.Att_Num
FROM Attendence a
INNER JOIN Dates d ON d.TheDate BETWEEN '2012-01-01' AND GETDATE() 
    AND d.TheDate <> a.Att_Date